watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor0:4576] Modules linked in: irq event stamp: 23188220 hardirqs last enabled at (23188219): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (23188219): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (23188219): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (23188219): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (23188219): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (23188220): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (16901438): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (16901159): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (16901159): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4576 Comm: syz-executor0 Not tainted 4.17.0-rc4+ #14 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0xa/0x50 kernel/kcov.c:100 RSP: 0018:ffff8801a18c79e8 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: ffff8801a18b0000 RBX: ffff8801c9869a90 RCX: ffffffff815e08fe RDX: 1ffffffff11a3189 RSI: 0000000000000004 RDI: ffff8801ce5f7640 RBP: ffff8801a18c7b78 R08: ffffed0039cbeec9 R09: ffffed0039cbeec8 R10: ffffed0039cbeec8 R11: ffff8801ce5f7643 R12: ffff8801ce5f75c0 R13: dffffc0000000000 R14: ffff8801ce5f7640 R15: ffff8801a18c7b50 FS: 0000000002743940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000274c978 CR3: 00000001a18a6000 CR4: 00000000001406f0 DR0: 00000000200001c0 DR1: 00000000200001c0 DR2: 0000000020000000 DR3: 0000000020000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: shrink_dcache_parent+0x179/0x230 fs/dcache.c:1486 vfs_rmdir+0x202/0x470 fs/namei.c:3850 do_rmdir+0x523/0x610 fs/namei.c:3911 __do_sys_rmdir fs/namei.c:3929 [inline] __se_sys_rmdir fs/namei.c:3927 [inline] __x64_sys_rmdir+0x36/0x40 fs/namei.c:3927 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455777 RSP: 002b:00007fff7e1b4dd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007fff7e1b6b80 RDI: 00007fff7e1b6b80 RBP: 00007fff7e1b6b80 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000002744940 R13: 0000000000000000 R14: 0000000000001497 R15: 00000000000e6243 Code: 72 1b 49 83 c1 01 4a 89 7c 10 e0 4a 89 74 10 e8 4a 89 54 10 f0 4a 89 4c d8 20 4c 89 08 5d c3 66 90 55 65 48 8b 04 25 c0 ed 01 00 <65> 8b 15 af bf 88 7e 48 89 e5 81 e2 00 01 1f 00 48 8b 75 08 75 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4583 Comm: syz-executor7 Not tainted 4.17.0-rc4+ #14 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:lock_release+0x6/0xa10 kernel/locking/lockdep.c:3929 RSP: 0018:ffff88019c4079e0 EFLAGS: 00000293 RAX: ffff8801ade783c0 RBX: 0000000000000001 RCX: ffffffff81c69cfc RDX: ffffffff81c6980d RSI: 0000000000000001 RDI: ffffffff88d8e320 RBP: ffff88019c4079e8 R08: ffff8801ade783c0 R09: ffffed003b5e46c2 R10: ffffed003b5e46c2 R11: ffff8801daf23613 R12: 0000000000011dbc R13: dffffc0000000000 R14: ffff8801da528460 R15: ffff88019c407b50 FS: 0000000001a60940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffdac185ebc CR3: 000000019ca82000 CR4: 00000000001406e0 DR0: 00000000200001c0 DR1: 0000000020000080 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: rcu_lock_release include/linux/rcupdate.h:251 [inline] rcu_read_unlock include/linux/rcupdate.h:688 [inline] d_walk+0x716/0xc80 fs/dcache.c:1327 shrink_dcache_parent+0x179/0x230 fs/dcache.c:1486 vfs_rmdir+0x202/0x470 fs/namei.c:3850 do_rmdir+0x523/0x610 fs/namei.c:3911 __do_sys_rmdir fs/namei.c:3929 [inline] __se_sys_rmdir fs/namei.c:3927 [inline] __x64_sys_rmdir+0x36/0x40 fs/namei.c:3927 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455777 RSP: 002b:00007ffdac1865c8 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffdac188370 RDI: 00007ffdac188370 RBP: 00007ffdac188370 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 0000000001a61940 R13: 0000000000000000 R14: 0000000000001691 R15: 00000000000e6217 Code: 8a e8 0f e2 58 00 e9 bf fa ff ff e8 05 e2 58 00 4c 8d 4d d8 e9 98 fe ff ff e8 f7 e1 58 00 e9 7e fc ff ff 66 90 55 48 89 e5 41 57 <41> 56 41 55 49 89 fd 41 54 4c 8d 65 d8 53 48 8d 9d f8 fe ff ff